added .editorconfig. !minor

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+charset = utf-8
+max_line_length = 88
+
+[*.{yml,yaml,json,js,css,html}]
+indent_size = 2
+
+[*.{md,rst}]
+trim_trailing_whitespace = false
+
+# tabs 2 spaces for makefiles
+[Makefile]
+indent_style = tab
+indent_size = 2